I have 50% stenosis in my ostial lad is there any hope for me?

My doctor told me that studies have shown 50% of heart attacks happen in people with less than 50% stenosis. Is there much i can do? I am working on lowering my LDL and raising my HDL, ALso take one aspirin a day, 1000mg fishoil and 40mg Zocor. I am 46 years old, with family history of CAD. I am a non smoker and my bloodpressure is and has always been good.